condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.857465 0.0 1.71493 ZT16-19 2.567815 2.567815 2.567815 ZT20-23 0.0 0.0 0.0